Reorder active support instrumentation guide (#37639)
Reorder active support instrumentation guide (#37639)

* Keep consistent verb tenses

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* Add link to "creating your own events"

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* Move section on how to subscribe to events above list of events

The list of events is really long, and most people only care about a
specific event or type of event.

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Edouard-chin/rails,georgeclaghorn/rails,Edouard-chin/rails,gauravtiwari/rails,yahonda/rails,mechanicles/rails,yahonda/rails,fabianoleittes/rails,Erol/rails,tgxworld/rails,georgeclaghorn/rails,Erol/rails,rails/rails,BlakeWilliams/rails,Vasfed/rails,joonyou/rails,schuetzm/rails,rails/rails,MSP-Greg/rails,iainbeeston/rails,tjschuck/rails,kmcphillips/rails,Envek/rails,rails/rails,yalab/rails,lcreid/rails,yhirano55/rails,yahonda/rails,vipulnsward/rails,mechanicles/rails,vipulnsward/rails,lcreid/rails,yawboakye/rails,Erol/rails,betesh/rails,Vasfed/rails,kmcphillips/rails,MSP-Greg/rails,jeremy/rails,betesh/rails,starknx/rails,palkan/rails,BlakeWilliams/rails,vipulnsward/rails,repinel/rails,Stellenticket/rails,notapatch/rails,fabianoleittes/rails,tjschuck/rails,starknx/rails,yhirano55/rails,yhirano55/rails,gauravtiwari/rails,notapatch/rails,schuetzm/rails,fabianoleittes/rails,BlakeWilliams/rails,esparta/rails,Vasfed/rails,kddeisz/rails,bogdanvlviv/rails,vipulnsward/rails,mechanicles/rails,EmmaB/rails-1,jeremy/rails,palkan/rails,jeremy/rails,georgeclaghorn/rails,fabianoleittes/rails,tgxworld/rails,eileencodes/rails,schuetzm/rails,bogdanvlviv/rails,jeremy/rails,tjschuck/rails,lcreid/rails,repinel/rails,yhirano55/rails,kddeisz/rails,kmcphillips/rails,rafaelfranca/omg-rails,starknx/rails,palkan/rails,betesh/rails,notapatch/rails,BlakeWilliams/rails,palkan/rails,iainbeeston/rails,prathamesh-sonpatki/rails,eileencodes/rails,prathamesh-sonpatki/rails,MSP-Greg/rails,yalab/rails,Vasfed/rails,rails/rails,iainbeeston/rails,yawboakye/rails,rafaelfranca/omg-rails,esparta/rails,eileencodes/rails,yalab/rails,EmmaB/rails-1,iainbeeston/rails,esparta/rails,repinel/rails,kddeisz/rails,kddeisz/rails,eileencodes/rails,EmmaB/rails-1,esparta/rails,prathamesh-sonpatki/rails,tjschuck/rails,joonyou/rails,Envek/rails,georgeclaghorn/rails,yahonda/rails,Envek/rails,Stellenticket/rails,mechanicles/rails,Edouard-chin/rails,notapatch/rails,yawboakye/rails,yawboakye/rails,kmcphillips/rails,rafaelfranca/omg-rails,repinel/rails,bogdanvlviv/rails,tgxworld/rails,joonyou/rails,Stellenticket/rails,schuetzm/rails,tgxworld/rails,lcreid/rails,gauravtiwari/rails,Envek/rails,Erol/rails,yalab/rails,betesh/rails,MSP-Greg/rails,Stellenticket/rails,bogdanvlviv/rails,Edouard-chin/rails,joonyou/rails,prathamesh-sonpatki/rails